In which crops is the method of mass selection applied?

Select the appropriate option for evaluation and selection of parents in plant breeding.

......... often becomes monotonous due to .........

What are the primary aims of plant breeding?

$A$ and $B$ were crossed to obtain sugarcane varieties having desirable qualities and the ability to grow in the sugarcane areas of North India. The most appropriate option for $A$ and $B$ is:

Plant breeding is: